Ceiling Fan Airflow Pattern

See what gives a fan power airflow efficiency and why.

Ceiling fan airflow pattern.

The flow under ceiling fan swirls along its path with the same rotation direction of fan blades with the core shrinking gradually and becoming diluted by the surrounding air. Our ceiling fan guide can help you with blade length fan placement and help you understand airflow. Since hot air rises a bottom firing exhaust fan will be working against physics by expelling slightly cooler air instead of warmer air. By diving the product airflow or cfm by the electricity use watts we get a clear understanding of have efficient the ceiling fan is.

Airflow quantifies the amount of air a ceiling fan delivers and is measured in cfm which stands for cubic feet per minute. Ceiling fan efficiency can be represented simply as efficiency cfm watt. This will cause the air to flow downward causing a chilling effect by allowing moisture to be evaporated from the skin. For fans the measure of efficacy is how much air flow you get for the amount of electrical energy you put in.

Fan direction for summer months to optimize air flow during the summer months the fan direction needs to be set to the forward setting. Do not mount exhaust fans on the bottom of the case. This study provides a. Cfm measurements are taken when a fan is on high speed then that number is divided by the watts used.

The intake exhaust direction should go front to back and bottom to top. Kichler has a ceiing fan guide to help you with planning selecting and installing a ceiling fan. Its units are cubic feet per minute cfm of air flow per watt w of electrical power. Exhaust fans go on the rear or the top.

The four areas that determine airflow are blade shape blade pitch distance from ceiling and motor quality. Unless it is a hugger ceiling fan that is designed to be closer to the ceiling if your typical fan is too close or too far from the ceiling it won t move as much air. If you have vaulted ceilings you ll want to add a longer downrod so the blades are about 8 to 9 feet from the floor. With this effect the thermostat can be set at a higher setting which saves energy.

The other ratings are needed in order to calculate the airflow efficiency of a particular ceiling fan. A good fan will give you more than 100 cfm per watt.